public abstract class StudyClassAbstract {

    public void study(){

        openBook();

        lookBook();

        writeBook();

        readBook();
    }


    private void openBook(){
        System.out.println("openBook");
    }

    private void lookBook(){
        System.out.println("lookBook");
    }


    private void writeBook(){
        System.out.println("writeBook");
    }


    private void readBook(){
        System.out.println("readBook");
    };
}
